Hexa-valent chromium removal from aqueous media using ferrous-form zeolite materials
US7105087B2 · kind B2 · utility
7Cited by
35References
3Claims
0Family size
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Key dates
| Filing date | Sep 17, 2003 |
| Grant date | Sep 12, 2006 |
| Priority date | — |
| Expiry date | Mar 9, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/913
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Systems and methods are provided for the removal and disposal of chromium form an aqueous medium. The systems and methods include the removal of chromium from a source by contact with either natural or synthetic zeolite that has been modified with a ferrous ion or other like substance. The spent zeolite is disposed of and replaced with freshly modified zeolite. In some cases the systems and methods are performed under de-oxidizing conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.